How to sincronize high data volume with GoldenGate – Part II

In the latest post, I documented how to copy/move high table data volume using GoldenGate Initial Load (with SPECIALRUN option).

Sometimes, we (dba/sysadmins) need to move HIGH data (tables with billion rows), in shortest time possible.

So, sharing useful tips, that helps to reach this goal.

Making GoldenGate Initial load work as PARALLEL:

To run GoldenGate in PARALLEL (with RANGE  option), it’s necessary to create remote trail file, so the diference from the first post, this will work with ‘RMTFILE’ option added in GGSCI>.

# On source GoldenGate  add follow EXTRACT (ggsci>):

GGSCI> ADD EXTRACT load1, SOURCEISTABLE
GGSCI> EDIT PARAMS load1

EXTRACT load1
userid ggate@goldengate
RMTHOST target-mgr.grepora.com, MGRPORT 7809
RMTFILE ./dirdat/il, MEGABYTES 1024, format level 4 PURGE

---Loading tables
map CUSTOMER.TABLE1;

GGSCI> START LOAD*

# On target GoldenGate  add follow REPLICAT:

GGSCI> ADD REPLICAT LOAD11, exttrail ./dirdat/ml, checkpointtable GGATE.CHECKPOINT
GGSCI> EDIT PARAMS load11

REPLICAT load11
userid ggate@goldengate
ASSUMETARGETDEFS
SOURCECHARSET PASSTHRU

TABLE CUSTOMER.TABLE1, TARGET CUSTOMER_CLOUD.TARGET_TABLE1, filter (@RANGE (1,2));

GGSCI> ADD REPLICAT LOAD12, exttrail ./dirdat/ml, checkpointtable GGATE.CHECKPOINT
GGSCI> EDIT PARAMS load12

REPLICAT load12
userid ggate@goldengate
ASSUMETARGETDEFS
SOURCECHARSET PASSTHRU

TABLE CUSTOMER.TABLE1, TARGET CUSTOMER_CLOUD.TARGET_TABLE1, filter (@RANGE (1,2));

GGSCI> START LOAD*

Tuning database inserts/updates:

According Oracle:

The following are suggestions that can make the load go faster and help you to avoid errors.

Data: Make certain that the target tables are empty. Otherwise, there may be duplicate-row errors or conflicts between existing rows and rows that are being loaded.
Constraints: Disable foreign-key constraints and check constraints. Foreign-key constraints can cause errors, and check constraints can slow down the loading process. Constraints can be reactivated after the load concludes successfully.
Indexes: Remove indexes from the target tables. Indexes are not necessary for inserts. They will slow down the loading process significantly. For each row that is inserted into a table, the database will update every index on that table. You can add back the indexes after the load is finished.
Note:

Shazam! \o/
Maiquel.

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